This series adds the EFI HTTP boot support. User can add the URI device path with "efidebug boot add" command. efibootmgr handles the URI device path, download the specified file using wget, mount the downloaded image with blkmap, then boot with the default file(e.g. EFI/BOOT/BOOTAA64.EFI).
This version still does not include the test.
To enable EFI HTTP boot, we need to enable the following Kconfig options. CONFIG_CMD_DNS CONFIG_CMD_WGET CONFIG_BLKMAP
On the Socionext Developerbox, enter the following commands then debian installer is downloaded into "loadaddr" and installer automatically starts. => dhcp => setenv serverip 192.168.1.1 => efidebug boot add -u 3 debian-netinst http://ftp.riken.jp/Linux/debian/debian-cd/12.1.0/arm64/iso-cd/debian-12.1.0... => efidebug boot order 3 => bootefi bootmgr
Note that this debian installer can not proceed the installation bacause RAM disk of installer image is not recogniged by the kernel. I'm still investigating this issue, but drivers/nvdimm/of_pmem.c in linux will be one of the solution to recognize RAM disk from kernel. (In EDK2, the equivalent solution is called ACPI NFIT.)
On QEMU, I can not make DNS work from the QEMU guest. The following commands work on qemu_arm64(manually set the http server ip in URI). => dhcp => setenv gatewayip 10.0.2.2 => setenv httpserverip 134.160.38.1 => efidebug boot add -u 3 debian-netinst http://134.160.38.1/Linux/debian/debian-cd/12.1.0/arm64/iso-cd/debian-12.1.0... => efidebug boot order 3 => bootefi bootmgr
[TODO] - add test - stricter wget uri check - omit the dns process if the given uri has ip address -> this will be supported when the lwip migration completes - uri device path support in eficonfig
[change log] v4 -> v5 - add missing else statement - add NULL check of efi_dp_find_obj() call - update document to remove "limitation"
v3 -> v4 - patch#8 is added to simplify the bootmgr default boot process - add function comments
v2 -> v3 - Patch#6 is added, reserve the whole ramdisk memory region - remove .efi file extension check for PE-COFF image - use "if IS_ENABLED(..)" as much as possible - 1024 should be sizeof(net_boot_file_name) - call net_set_state(NETLOOP_FAIL) when wget encounters error - describe DNS ip address host name limitation in document
v1 -> v2 - carve out the network handling(wget and dns code) under net/wget.c - carve out ramdisk creation code under drivers/block/blkmap_helper.c - wget supports the valid range check to store the received blocks using lmb - support when the downloaded image have no partiton table but a file system - not start the .efi file in try_load_entry() - call efi_check_pe() for .efi file to check the file is PE-COFF image - add documentation for EFI HTTP Boot
Masahisa Kojima (7): net: wget: prevent overwriting reserved memory net: wget: add wget with dns utility function blk: blkmap: add ramdisk creation utility function efi_loader: support boot from URI device path cmd: efidebug: add uri device path doc: uefi: add HTTP Boot support efi_loader: create BlockIo device boot option
cmd/efidebug.c | 50 +++++++ doc/develop/uefi/uefi.rst | 30 ++++ drivers/block/Makefile | 1 + drivers/block/blkmap.c | 15 -- drivers/block/blkmap_helper.c | 53 +++++++ include/blkmap.h | 29 ++++ include/efi_loader.h | 3 + include/net.h | 17 +++ lib/efi_loader/efi_bootmgr.c | 248 ++++++++++++++++++++++++++++--- lib/efi_loader/efi_device_path.c | 20 +++ lib/efi_loader/efi_dt_fixup.c | 2 +- net/wget.c | 206 ++++++++++++++++++++++++- 12 files changed, 634 insertions(+), 40 deletions(-) create mode 100644 drivers/block/blkmap_helper.c